Meaning of “alternate angle” in the English Dictionary

british dictionary

"alternate angle" in British English

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alternate anglenoun [ C, usually plural ]

uk /ɒlˌtɜː.nət ˈæŋ.ɡəl/ us /ˈɑːltɝː.nət ˌæŋ.ɡəl/ UK specialized US alternate angle

one of two equal angles on opposite sides of a line that crosses two usually parallel lines (= lines that are always the same distance apart), and on opposite sides of those lines

(Definition of “alternate angle” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)